The N54 is one of the most capable turbo sixes BMW ever made—and it'll destroy its own oil temps before you finish a second stint. Most guys throw on a JB4 and call their 335i "track ready." Meanwhile their oil is hitting 280°F by lap three and they're wondering why rod bearings are grenading at 60k miles. A standalone oil cooler isn't a mod. It's insurance on a motor that deserves better than being slowly cooked from the inside out. Save this for when you're shopping. #ThreePieceUS #E90 #335i #N54 #BMWPerformance #TrackDay #HPDE #TwinTurbo #TrackPrep #OilCooler #BMWBuild